Grass Pass lies only one kilometre southeast of Gunnery Pass and is the same elevation.

The name was made official in 1980 at the suggestion of Gillean Daffern.

The Boundary Pine was a favourite destination for Raymond M. Patterson's family when they lived on the Buffalo Head Ranch. The pine stands on a ridge near Grass Pass which was near good springs and grass. The steep sides of the ridge formed the southern limit of the Buffalo Head grazing lease. A photo of the pine taken in 1942 appears in "The Buffalo Head" by R.M. Patterson and in David Finch's biography, "R.M. Patterson -A Life of Great Adventure."